docs: def get_mean_and_stddevs(self, sctx, rctx, dctx, imt, stddev_types):
          """
          See :meth:`superclass method
          <.base.GroundShakingIntensityModel.get_mean_and_stddevs>`
          for spec of input and result values.
          """
          # Get original mean and standard deviations
          mean, stddevs = super().get_mean_and_stddevs(
              sctx, rctx, dctx, imt, stddev_types)
          cff = SInterCan15Mid.SITE_COEFFS[imt]
          mean += np.log(cff['mf'])
          return mean, stddevs